Michael Crichlow

I attempted a flight from KLAX to EGLL. I was holding short of the runway, waiting for clearance. When I received clearance, I advanced the throttles, and nothing happened. Everything had frozen. I had the moving map up and tried to zoom out but it didn't move. Moved the joystick and nothing moved. I'm not sure if this caused it, but I had the ground control page up on the OIS throughout the taxi. Has anyone else had this happen.